From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: [PATCH] pata_of_platform: fix no irq handling Date: Tue, 12 Aug 2008 18:18:42 +0400 Message-ID: <48A19BC2.8060008@ru.mvista.com> References: <48A05152.7020508@harris.com> <20080811151913.GA14690@oksana.dev.rtsoft.ru> <48A0676E.5020308@harris.com> <20080811170756.GA29827@oksana.dev.rtsoft.ru> <1218492032.8041.11.camel@pasglop> <48A19788.6050502@harris.com> <20080812140457.GA9103@oksana.dev.rtsoft.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from h155.mvista.com ([63.81.120.155]:25788 "EHLO imap.sh.mvista.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751227AbYHLOSu (ORCPT ); Tue, 12 Aug 2008 10:18:50 -0400 In-Reply-To: <20080812140457.GA9103@oksana.dev.rtsoft.ru> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: avorontsov@ru.mvista.com Cc: "Steven A. Falco" , linux-ide@vger.kernel.org, Jeff Garzik , "Sparks, Sam" , linuxppc-dev@ozlabs.org Anton Vorontsov wrote: >>>>1. IDE status read does not work. (But am I understand correctly >>>> that IDE works well if IRQ is unspecified? Then this is hardly >>>> an issue.) >>>>2. IDE interrupt comes when it should not. I'd recommend to use >>>> oscilloscope to find out what is happening there, that is, if >>>> the drive actually deasserts its irq line after status read. >>>> If so, than this could be a PIC problem. >>>>What is the platform on which you're observing the issue, btw? >>>Another possibility is that you got the wrong interrupt number >>>in the device-tree... >>>Ben. >>The platform is the AMCC Sequoia board. We've built a little adapter to >>connect a compact flash card to the processor bus. I believe the >>interrupt selection in the device tree is correct, and I've checked over >>the u-boot settings for the IRQ line (active high, level sensitive). > IDE IRQs are active-low. Only on the PCI and only in the native mode. Natively, the IDE INTRQ signal is active-high, rising edge triggering, as on ISA. You seem to have an invertor somewhere, if it's not a PCI chip... WBR, Sergei